Forty million people, 5.5 million acres of farmland and the livelihood of residents in major metropolitan areas such as Salt Lake City, Denver and Las Vegas depend on the Colorado River, described as the workhorse of the West and under assault by drought.

The U.S. Geological Survey is in the beginning stages of learning more about this river via an expanded and more sophisticated monitoring system that aims to study details about the snowpack that feeds the river basin, droughts and flooding, and how streamflow supports groundwater, or vice versa.